JORDAN CONTROLS SM-1715, Instruction Manual

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2.In equation, if the value of X is equal to 0.5 or 2, and if
upper shaft position is not equal to 100% (90°), and/or
lower shaft position is not equal to 5% (0°).
To lay out the cam shape for the desired input-output
relationship, it is necessary to determine outputs (rise in
cam), for various inputs (amount of cam rotation). The rise in
the cam corresponds to % of maximum output range and the
amount of cam rotation corresponds to % input signal to
amplifier.
1. Lay out on graph paper, axes and maximum and mini-
mum slopes as shown in figure 2. (Maximum slope is 25
units rise per 10% shaft rotation; minimum slope is 5 units
per 10% rotation.)
2. If either upper or lower shaft position is not at 0 or 100%
(0° or 90°) respectively, lay out additional x-axis scale as
shown in figure 3 on page 13. Use both sets of values
when plotting cam shape in step 3.
3. Calculate outputs (rise in cam) for 5% or 10% increments
in input for entire input scan (actual cam rotation). NOTE:
only output values that fall within maximum and mini-
mum slope lines can be used.
4. Plot these values on cam. Scribe smooth line between
points and grind cam to this shape.
Refer to example for typical cam calculations and layout.
TYPICAL FEEDBACK CAM CALCULATIONS
EXAMPLE: Assume X in (input/output equation) = 0.5, and
that upper and lower shaft positions are at 100% and 20%
(90° and 18°), same as center illustration of Figure 3.
Figure 3
Figure 2
Figure 1
Note: These values fall outside of minimum slope on graph.
Input
0 20% 0
10 28 1*
20 36 4*
30 44 9*
40 52 16
50 60 25
60 68 36
70 76 49
80 84 64
90 92 81
100 100 100
Output
% of actual
rotation
location
on cam
% rise
on cam